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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdc254353bfaef2a54ff6ea91bec63cd0e50563a08cd5549757dedef2723d49e' 
  AND token = 'AULcAo5YQ8dTnu5tixsKvfViLo4J8vPLhi+WCyId4kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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