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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1dd34b01eb501f5fdf250644c5586b27e70c194bc482ea06048f17426e62263d' 
  AND token = 'MUab4I/T6jTtNr+JlhAfuYm6M4KyHA8g+MGI+Pk6AoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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