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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c55eda47dcc7502143fb47eb8a0067e8452809cdeebd07d2a9bdd57fb8f7b36c' 
  AND token = '+tWYNdfjA9iJDlsgUMmj3gszlKY0WX1Wyl+5eJjKiJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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