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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3b53014aca6b784ba7b09a4524ae5e99b430d125dff085c542621f4f40c89b71' 
  AND token = '4OfVHT3M4PnIvQr8iBCoBGb6H2MznE7M11lOE7Xyk08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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