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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf535e61d9ac7ef3e93449e8b35a238828815ec87c5a4dc4cafa72af4ae13f80' 
  AND token = 'Oz4/lDc72rKa4ccOozvZl7V5ck7e+qIkqi5vE1fXr/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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