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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c09a2fbd207385ec52f4812362a4ad4b3c714245dde30614aa30b88a55677a7a' 
  AND token = '9Lg/c3JgSqmMbQ6M3xaMxyUWhKGw0Q0KsJo85CJ9JxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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