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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12138451e28ee78f0df7d55b4fb9b4be40fc54c6aaaea084ac365c20a5926459' 
  AND token = 'DJ1WHi1E6p8lo39ksbRB7TYK0HSZSiyjfgZ05nsdCZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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