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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49442992b0746a225b8fb99a530cbb85fc4f3102a1164dfb5c1765c2e8419007' 
  AND token = '0mBE/d8H/yAgprsw5rNmtbFc3tGUdgk9YUZimj04OvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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