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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc4b7c51e59fc1401218a97bc2acb9b90e58b6aabe6c3290f1f088467de54e11' 
  AND token = 'X+JsPxwLrsujFQN59WtuPWDKYwb3IysjROK4mYxIw58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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