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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '851ef50f03b233767c3919e67a06e0dfbc43ab5c030dd20869a41a8734c99c1e' 
  AND token = '4v8sSjG2pEHx2ru5ZTn9a5UnMyDaqQ2uk6UBAJbiZC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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