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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85a65c1299b6684375aa71f3621fc1ba95ca2722d8232bb15099a9dc032b6849' 
  AND token = 'NVF1sW3y6gnP90bk+RRJJ/rs9IJob+xU3uv0ZcyGH1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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