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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7c67e73dba52f8eeee5b0a6999d3eb492f17822bb36c025456ee31c55a3f598f' 
  AND token = '3w5kkM+DTC5fiZXtKI3hE9GUbeh0nzBc/RACygubgZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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