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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bef96099960ab851ea27af989e0b799cb13b99d6363210f22b61898d57aedfba' 
  AND token = 'GwyXHoErS2baGBwaSzKnqaAwf5RUp74Z6uTxsRn6U/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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