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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9bdc117f5fe6bba889d97ac5772f57e8a59c3fa0a6b7062a3cf4e7eefe1d86a' 
  AND token = 'vzjoaNhWnmA7m+jJUE8MD5rnu26kS5jpVxzo2RCt1iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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