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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfa19b0caf5a484d842a7e36bbf8937c7e3b54aff68b23bd562616b034de65ae' 
  AND token = 'JJxoUifarh+Bl/piEfii+6NoG+2FB8cbPTqmGRCab/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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