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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '107ea10f2005f723106fec411433fd7e65877cde5f77c5d3e26c2334fe0f36c4' 
  AND token = '90CQ3FDxIH1S3VKYzxe6+E/LLSu44mA/ExwGle6qPHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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