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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3762b93034c73b4c3cc25f60704d2c6247a576e007df2cd675beaeb53b48b88f' 
  AND token = 'uvwVB44tuzFcsCVqLu/9tBo034dMiQatr4XKEhOSsp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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