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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd57b5baed8d296c719424e159314dbac053cdca20141847478aad3092c1a5d1e' 
  AND token = 'd/i0GR0IzoW8Iv/Y9aDpKP46THm2iLrSBH2biDcE1eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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