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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11e797e28d474fc32d5b82d4fcc88d197a3136ad25c95321ec050ffe67678195' 
  AND token = 'EUew2A6uX4uj7Jn8vOpE7HT2xFrqHeU5WEMHJz/TUiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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