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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bfd2f2ee885e28a6cc488f1efb45fc04932ec58813b31c6ff31cbada90ac0af' 
  AND token = 'NqzWTiUX8iC+xm8D4MqJ1DZz5BaMEQ8aBkfFQ3xBusA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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