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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5479cc84c46a9aa32a61bb7bcb4f6bd68b7e5569d15471bbaf5b4cfc7bb8432a' 
  AND token = 'a2xrskVUpkCUIVj9ca8F3/daHicGtzzqZb79DJ+Rycw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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