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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '340cfd412280b43e173204320e16b0f6149a48a35a0471dd80b97c765b12b24c' 
  AND token = '2eEeQQ1gKLp3ilPHv2y9pWRJXGdGeu28u1lSSh463Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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