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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbde6da6c3b770733c672381edb62ac3d94d732e0074a8d7009c895967b872cb' 
  AND token = 'rQNqb39SgqjmqOlKUDxk1kkmhstpwDgHo0+f+G4akds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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