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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd1cda60ae826276fda9558573b36dfd7a86a7d066d4a8deb94c8baca82963c9' 
  AND token = 'OOSk1HBD+ee/jd6a3TehNB+cAciDL8BdPvyDoaxFhRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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