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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a4b5d6f0ae2c8242ccdb7acb1936c68f145272c8a0dfcb95fba3ea3fc1d15d0' 
  AND token = 'FxYe0xmKAFyESCf8qrpC9TzdsydS8xTOVV+EF/U4HZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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