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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '487b17835aed6d8a7d48ca0a9e17e5796ff0041b11f59443db8d681a79ecd4e7' 
  AND token = 'GAKeE1i2F9XZtym2tLwrZCYUOJObi68SCGxtYtY0Tjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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