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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a6a43153b5af4cbe8029bf3ce4ecf428f235ca9379a2f192becc45937b9fab9' 
  AND token = 'c3sysJSABELKj8U8mfkWo9vRp6XcYKCI1QEDdipeuXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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