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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7353c314a71f398ec6b0a9cfba17c33aaa38a804f6c041adae65af459f3241e8' 
  AND token = 'np4HKfZj87POnA6kR1bR5rWNKk9JZyoQtKqXpZPC+RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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