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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '254b0a02e0a08ea57f8f93444a5b97de7f44a464b78d8bc389d8e73166d56ec0' 
  AND token = 'P+c+usZyw13BapzsWYfe7Ue8ZqXMkhfOuw79p9YkOeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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