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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd71df3b4cd115b86a514c33d6d9cd1a651f373c88b8c8a8dc44ae1197dc5ea4' 
  AND token = 'hNufuZrUnimidYwxnmccx7DHjN0F7tmBA+uBy7MtK50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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