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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f694d79ebc9964a45d5fdbad36cd550395c4a77a3f3b1be3d42d0aa19c199e2' 
  AND token = 'Fn5HplGgfRzUm+grc8TMyV9XxqVkdcdBIQGjIagf9Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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