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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c20f9d35a8b96e272fb1b3e43c6a22d8c479269e6a35a7bb3dee708c8976e16' 
  AND token = 'uEfyKBbqN3omOaGU7WepkR1ucGJigFCWx/9CF74dz9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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