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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eed8238e5bde50dc40b58465fbe15a6a6fd8d1a9ac3da1a414445d219c503dc6' 
  AND token = 'LdNpuJB/TkewsphwJvwEJzfuvUZDo30iO+mO92kxbKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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