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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f98727bb976ac662872fd284df631a0582b3afbd320580423382c2e20de5c942' 
  AND token = 'xZKpu0OsZw72aftgVuA+k454VSg1/4VkMWopV5CHLdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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