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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfa9a56da3f3164040154318ae46d520ae420e845ba79711c22b3d99726d6fc6' 
  AND token = 'ed2Qefw4CQ1xbq6J6l3uG2JZdPXZF/ML5AJJx4MBA8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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