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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a8bf3a71dd87f1e3addf21bc6b3082abfb91fe85ad804108cdbf4f42d983fce' 
  AND token = 'op7KpvouAyipbkZOrEwiPY49lg0Dr9ggIfP42dPipUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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