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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6618b7c93996d0026d8b98f9f7a92ef069796ef04a531abadf97a286771ad132' 
  AND token = '1O/hDgTLScuJJ9Lt+QZ/ig1kFUL8ntjmpZy3cGsLyEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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