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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17f1ceb37cdd97586db2054e6f75d2a3f69cf4c6b26defe5db3b8f104975e93e' 
  AND token = '4sxgDbNjbRGBRhMtEd20RRIyL75A9MjMZzUQ9GWhVU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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