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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '37ee953dc108d0f58dfe7273b4a9eb5b0cfeabd0e94e7441d39c8d9b6790a5af' 
  AND token = 'Dmu5zfnhUzhTeKjJFKpYei126673Cd4bKN0j8j82WLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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