SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '597fead3ee7fed1437b00574a6eab52a4977045fe893fa144f15d26ad6d72e4d' 
  AND token = 'UtlxlgVKNhSJCEnSBFEk3U6DOjUXs0FejYGqWPiDPnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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