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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b1a6781d4785682da0c5ace68d049478047673a566c800de86bf62b3e9ffdc3' 
  AND token = 'TiHp+kCBPc2kDifCW2YG6dFMqjP/VYRnOkZcra8Sgsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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