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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '530db802e53bdb3e73e1020d6cfafa089d7b6a07238a4929911c52f8deadbeae' 
  AND token = 'kessUNHmD+ho6BHT4o2riC7sIpEIR6YhSWWYzXwpD7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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