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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0c96994e8f0ce4237c4c4e650adbbf074a67abf4e1888e28e0c317844265d8a' 
  AND token = '5gVOQSAIxnlc956wueWV7YjiXVtrBUFgdQKIYABgAsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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