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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e6cfd8101427e0db2393dfa006e71a7b439251ec2772ce4c5de21fbef0ad274e' 
  AND token = '/yc29uI5Fl7CbzPu5fLOk3WzhZAytvuJoiGTORxdQmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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