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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9f8d04acdbbfa1ac8c957cbbb3e154d8dd8d3a5b36993cf5be68d976a40033e' 
  AND token = 'YL642whWqxc76GoMGdEZ1N4URq+yca3XNyOlp/UcwNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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