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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3f1eb9a8685e6d3d382409d9a87516476d1b4768668a3073607f4f8d44397ce' 
  AND token = 'rP25S+tFeHFOa+koE4AigqnnI0PGuxre0J0sbynba6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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