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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4ccc4da1b6fce30970cc9d66816eab158dbf47e8f67a69172d4faa99b5aeca0' 
  AND token = 'mzNIGOZcP73T16po3gLOZNlMsvEX+lT8Cvjb+ZfkMqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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