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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1338659eecb0f1df88a3177abd03e1c5a5a88e3b66888f3d4475b352923e55d' 
  AND token = 'FOTqY0XPPwi8ZM0NP0Vlx71V/IO1lfuJ3smEHKhf4xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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