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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d40783d7a4e04857d8b4ea294bfe57ad346cc942489c9b90df96f085e9486d6' 
  AND token = '+PQM68D2skUCIC8DZxcd394UTwqNN1052ZiSvJb+Nc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00343

JSON explain

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