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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4cd9311a85272cc1ca4e0eb9bd9f5c2d8da42f5ff570c6003cb0c640ae882a5b' 
  AND token = '88hPiKP41gzgDNIhV0fUfgov5W/wtsryoADEQlh+zgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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