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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '299f665d293c9f3d28213794f10c78b3ef8fecaab8ba6a46d8fb002bf95a3f88' 
  AND token = 'El9883KWuFJ2T+4FTSEyxVFz5tj37HZ+xH/e3fe1ULY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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