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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf9aa836ae8f3ca84db716ef60e310f38b89dd7a2dfea20a2eb1a6c3e43d3454' 
  AND token = 'FEkU/IjB/fnGXRZwGasbPiRCRgey5ab1PaSx+4Rgmxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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