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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9175241e2dfa3b747dff4ae5f2b2817319f8096dbbed85009fb8c4171d202fe4' 
  AND token = 'TeWs0cpeiKzF3Htza8QrI7K07o8wCQi1sKmr/6YhlL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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