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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d220b8a7eda455c43df235f97091c97bac01ad78470dbacc2c24a4625d1a2a9' 
  AND token = 'b7TiM71tOFAnDpqv98XG7V+rPmj1FMwBk/yOBKSH9tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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