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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '954adb8d38757dd7dbe95783e66128226eae236301374625d757ec270d348d9d' 
  AND token = 'YXZ34DdAu06+5DBwKGA7HMYNQ8G0zOow8nN95FQZplg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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