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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'caa4a901d45ccf0421368057ef5a50b3562b1cca5f3e9589a721c48200f354cf' 
  AND token = 'gO1o7N8xmWH4nxiKt8tlQb3WLR/Q1tTaPCNtORs1za8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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