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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f310ead2d785151110a38c5c79460a30d64f1cc2dd3cbde987394ee98d93b520' 
  AND token = 'X0Is2YGYi1VmGY0qh2wN0Ic+owncVETd0bSHyx6PgTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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