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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28f42a14ee24b738cf4a5fa8a8e48f1316daddd589226afa7229ff18ffe0de3a' 
  AND token = 'Ft94bISVineswyM7riOzPAbzr1ZQ9y94i+l5Zn+J3NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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