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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f25512733ccc9985b4ea8a77c909e9b20cbd6d345c5b31d76c2aad38dbfad41' 
  AND token = '6vAlDt/BgfdYznRO7N4D2Yo6cF28ksxFdUtFDjF3Sso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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