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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '95673672cc33d88bce68dfa1b18686740e7ff6e7ca88434188b38a45c3373829' 
  AND token = 't9UG26KABq7IoJLITYchfuM+3e5U+Tmfs2UenkjJUKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}