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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f648ab3ba5b44fce69c819efc82a3dbc64561d2486e8fa708456fa80f6c0529a' 
  AND token = 'PA7p2dkqiLKMBowm59aYKsrF8eg5t/udg6WJ8Fno7ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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