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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e129c54ecac7012295ec04e32ea7f575b322dcdb5e3dae53ca3311c329db85b6' 
  AND token = 'AsptszzT+RJaf+zLGLrNRa8QhTWhpZJreNyGrflLib4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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