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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31b52856012bcd52ba83f7c14a21241139e6caf742195bb35fc888d951394980' 
  AND token = 'RFv02j8ZGN92R3cfhPmCUfC69pj6WAnELJNWHlDEdC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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