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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '667f864de13fda845e30ca8aa67478e0960c8b6311bfd09a5d2c1537fcb65c7f' 
  AND token = '5AY43o6kV66ruyik+5bI7qHYkPT0qgz1uwpbK1UElpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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